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Plasma Physics and Nuclear Fusion

Plasma Physics and Nuclear Fusion. J. C. Sprott Department of Physics University of Wisconsin - Madison Presented to Physics 208 on October 30, 1998. Outline. Fission versus Fusion Requirements for Fusion Plasma Characteristics Plasma Confinement Experimental Devices.

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Plasma Physics and Nuclear Fusion

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  1. Plasma Physics and Nuclear Fusion J. C. Sprott Department of Physics University of Wisconsin - Madison Presented to Physics 208 on October 30, 1998

  2. Outline • Fission versus Fusion • Requirements for Fusion • Plasma Characteristics • Plasma Confinement • Experimental Devices

  3. Advantages of Fusion • Inexhaustible Supply of Fuel • Relatively Safe and Clean • Possibility of Direct Conversion

  4. Requirements for Fusion • High Temperatures • Adequate Densities • Adequate Confinement • Lawson Criterion: nt > 1020 s/m3

  5. Two Approaches • Inertial Confinement: • n 1030 / m3 • t 10-10 s • Magnetic Confinement: • n 1020 / m3 • t 1 s

  6. Magnetic Confinement • Magnetic Field Limit: B < 5 T • Pressure Balance: nkT 0.1B2/20 • ==> n  1020 / m3 @ T = 108 K • Atmospheric density is 2 x 1025 / m3 • Good vacuum is required • Pressure: nkT  1 atmosphere • Confinement: t  1 s • A 10 keV electron travels 30,000 miles in 1 s

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